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<p>[QUOTE=&quot;doug444, post: 1906141, member: 38849&quot;]To answer the original question, ZERO.&nbsp; Toning&#039;s a racket.&nbsp; Toning is a coating of silver sulfide from 40 to 125 nanometers thick (Weimar White&#039;s book, &quot;Coin Chemistry&quot;), and the chemical reaction is the SAME whether it&#039;s natural or artificial toning.&nbsp; In the long term, silver sulfide will cause microscopic pitting.&nbsp; The same process occurs with flatware, requiring frequent polishing.</p><p><br /></p><p>The original source of the sulfur is the atmosphere, the packaging, the albums, or adjacent paper(s), or a combination thereof.&nbsp; That&#039;s why they dipped coins 25 to 50 years ago, to get rid of the toning.&nbsp; But in that time span, the toning has formed a second coating.&nbsp; &quot;Purple&quot; toning is especially hard on a coin&#039;s surface.&nbsp; Buy and read White&#039;s book.[/QUOTE]</p><p><br /></p>

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